Consider how salvation is a wall and how gates are praise.
I. There are three safeties which a sinner wants. First, he wants to be saved from the condemnation of his sins; then he wants to be saved from the power of his sins; and then he wants to be saved from the conflict and presence of his sins. Therefore a man's salvation comes to him with three unfoldings. This threefold salvation is, to every man that receives it, as a wall. On the one side, towards the adversary, it is a wall of fire; on the other side, as it shows itself to him that is within it, it is shelter. It is beauteous, as with all bright and precious stones, inlaid with all the loveliness and the attributes of God. And whatever comes through that wall to touch a man has first touched and pierced his Saviour; for all the faithfulness of God, and all the power of God, and all the glory of God, and all the work of the great Mediator, go to make the eternity and the sufficiency of that great bulwark.
II. "Thou shalt call thy gates Praise." What is praise? The joy of a happy spirit, pouring itself back into the bosom of God as its only fountain. Through the walls of salvation, the Christian enters into a perfect peace that with a happy heart he may go out praisingly. In every object in nature, he likes to see some reflection of an unseen world; in every providence, he traces a Father's hand. He has thoughts high above, that make him walk this world an independent man. Heaven is gilding all the distance to him. He comes at last to Zion "with songs and everlasting joy upon his head."
J. Vaughan, Fifty Sermons,1874, p. 165.
Praise is loftier than prayer. In prayer, I bow in my own family; in praise, I join the general assembly and Church of the firstborn written in heaven. Prayer isolates me; by my wants and misery it sets me apart. Praise unites me; by my glory and my gratitude it makes me one with the universe of adoring creatures. Prayer is the wail of an imprisoned spirit; praise is the song of the emancipated spirit floating over and through and out of time and space. Prayer speaks of its want; praise, of God's fulness. Prayer centres in self; praise anchors on God. "Thou shalt call her gates Praise;" these gates revolve on four hinges, or rather, to drop the mere allegory, praise is composed of four emotions. These are adoration, humility, affection, and gratitude, all praise strikes these four notes, and includes these as its spiritual elements.
I. Praise is the gate by which we pass out of ourselves. What is religion without thankfulness? There are some persons to whom it seems impossible to take the wings of the morning; their religion seems at best to be a divine kind of grumbling, which would not be if they could but pass through the gates of praise.
II. It is by this path that the believer passes from his old state; it is through these gates that he passes under and into new relations. He enters the Church through the gates of praise. Gratitude is the very bond of our fellowship and union; it is when we speak of our gratitude that we know each other. The Church is a city built of hymns and hallelujahs; its walks are salvation.
III. The gateway by which we pass to higher knowledge and to higher life is praise. A grateful heart is a learned heart, and it is the companion of a thankful mind. The whole universe is a cathedral of praise; its gates revolve on their hinges of melody; they heave and lift themselves with Æolian airs. This idea filled the mind of the Psalmist when he said, "All Thy works praise Thee." In all the wonderful adaptations of the mind to things, and things to the mind, God is praised.
E. Paxton Hood, Sermons,p. 153.
References: Isaiah 60:18. S. Cox, Expositions,1st series, p. 79; Bishop M. Simpson, Sermons,p. 279.